Answer:
it will take 16.89 years for the account to increase to $2 million.
Step-by-step explanation:
PV = $400,000
FV = $2,000,000
I/Y = 10%
Solving for N in:
FV = PV * (1 + I/Y)N
$2,000,000 = $400,000 * (1.10)N
5 = (1.10)N
N = 16.89 years
Therefore, it will take 16.89 years for the account to increase to $2 million.